Method and apparatus for screening wet material



April 25, 1939. A. w. LISSAUER 2,155,764

METHOD AND APPARATUS FOR SCREENING WET MATERIAL I Filed July 30, 1936 INVENTOR. Adol /z WILissaaer A TTORNEY --Patented Apn25, 1939 narnop marrmrrns Fort sonar:

JOFFICE Adolph W. Lissauer, Louisville, Kygassignor to Louisville Drying Machinery Cot, Incorporated,

e, Ky a] corporation of Kentucky app icati Julyfill, 1936', smamst m r 9 Claims. ((71. arc-1 51) invention relatesito a method and apparatus for decreasing the liquidcontent of materials such slop, paper pulp, cotton .li-nters,

rent equipmenhjtherebyreducing maintenance 'I'he'United States Patent No. 1,669,973, issued 15 to Julius Credo, discloses a type of reclaiming .or

screening apparatusflthat has been quite extendistillery slop. ,Although .the. Credo "apparatus is an improvement over earli'ei-apparatuses, long 20 use has shown thatfchains 15 break, permitting broken links thereof to pass on withthe solidsof thej slop, and seriouslyndamage othjenmachinery.

I'he'apparatus of the incident invention eliminates this objectionable feature, of the Credoiapparatus, and is constructed so that it may readily replace the chains, paddles and sprockets of existing Credo'reclaimer's.

In order to further warrant a. replacement of the 'Credo reclaimers the apparatus of the in- 30 cident invention iskconstructed and arranged to provide greater capacity and efficiency "fo'rthe same size screen employed on commercial. Credo reclaimers.

. distributing means that provides a transverse as well as a horizontal movement of, the wet objectionable chains and spro'ckets.

' Figure 1 is a plan view of the apparatus with portions removed to reveal detailed structure.

Fig; 2 is a' side elevation offFlg. -1 from wliich 5 the near wall has been removed to disclose structure in run lines.

Fig. 3 is a -planview of a setof paddles,'sometimes referred to hereinafteras a "rotor"; and 'one phase of the relation of material inprocess to 50 same. 1 l

Fig. 3A is an elevation of Fig. 3

Figs; 4 through are plans and-elevations 2 illustrating modified constructions for the rotors.

Reference characters IS- 18, 11-48 and l9, .55 respectively, represent sides, ends and bottom of v indicatedby the curved arrows in Fig. "1". should benoted thatthe paddles of each successive shaft are so related; that they traverse an "shaft 3 4, andfasfindicated by"v the power transsubstantially uniform layer or bed of-rnaterial reto gravitate from "the top to the bottom end of copperf plates orother screening material 22. 5 Maibps'ills 2i provide sub-troughs 23-24 that ,collectiandjconvey separated material to outlets 25, 26. At'thfe upper end of the trough, is a feed hopper i-II that receiveswet material for treatment, while the concentrateorrecovered residue 10 discharges from7the lower and i8 into disposal 1, Attached tothe sidewalls of the trough, are

beams Ill, each of which carries a, bracket 3l.'

)Ea'ch bracket {is fashioned with .a vertical journal I ffora vertical shaft 32], and agpair of horizontally sively used for [reducing the liquid content of spaced journals 33 in which rotates amain shaft j To ,thel upper end of each vertical shaft is keyed a "gear-138 in mesh withan associated worm 35,

.-while, attached; to'the lower end of each vertical is a hub, 31 quipped with blades or paddles r 38 for controlling andmanipulating the wet material under treatment, referred'to hereinafter as materialf. Right and left hand sets of worm ,gears are employedto impart clockwise and counterclockwise rotation to the vertical shafts] 32, as It area overlappingtheflarea traversed by the padv f'jdlesof-eachfadjacent shaft; Mitregears 39 and Thus theprincipal objector'thisinventionresidesin the 'provision'of rotatable stirring and shaft, 4 0 transmitoperatingflpower to the main pitting equipment the" paddles driven by the main shaft travel slowly: material, and which eliminatesthefuse of the 5 The-mounting of brackets 31, and the method ofgadjusting'sameinrelation tobeams BIJJdoes A-preferred embodiment of myinvention is illustrated in the accompanyingdrawingin which not'constihite a part'of this invention, therefore,

, 40 "the details are notincluded. However, it must spaced frbm'and parallel to screens 22, so that a" in contact with'screen 22, for the purposes 7 adverted in the said Credo patent.

Bylocating t paddles, so that their bottom edges are set at aselected zdistancefrom screens 22, a filter layer orbed ismaintained and allowed the; trough in asubstantially straight path, while the-material above the filter layer has'an entirely different course and treatment as described hereinafter; 55

separation over and in addition to the Credo method is procured because of the mechanical pressure applied to the material bythefpaddle, j and the greater distance of travel provided therefor. The paddle may be perforated, as indicatedin Fig. 3A by numeral 38L .toa permit liquid to drain therethrough, and onto the established filter bed. As the paddle progresses, the material will drop away, substantially asindicated by ref-' erence characters 42, 43 and 44, and be gathered by a paddle of an adjacent rotor, wh.ich similarly transfers it from the far to the near side of the trough. This process is repeated, 'ser atim,by the remaining rotors to the last onewhere the concentrated material gravitates into duct 21.

In Fig. 2, the elevation of the paddles represents all of the bottom edgesas being in a common plane, whereas, in fi the bottom edges of adjacentblades are disposed in different planes, consequently only the opposite blades havebottom edges in the same plane.

Fig. 7 is an end elevation of a paddle of the rotor shown in Fig. 6,-and is illustrated inclined in the direction of rotation, with material gathered and downwardly pressedfor expediting removal of the liquid content. [The curvedla'rrows in Fig. 6 indicate clockwise and counterclockwise rotation for the rotor. [In Fig. 6, all

paddles are indicated as being inclined in the same direction for applying pressureto the material, when rotated in the clockwise'direction, or, functioning as a plowwhen rotated in the counter-clockwise direction. However, adjacent paddles can be inclined in'opposite directions, so that, in either direction of rotation, the material willbe alternately,compressedagainst the screen, and then lifted or plowed away from-[the screen by a succeeding paddle jItmust be understood that the paddles can "be. made. of solid or perforated material, in whole. or part, and adjustable as a group, or independently, forthe accomplishment of objectives according to the behavior of the material to be processed. Thus,

the inclination foreach paddle canbe selected according to whether the material istobe transferred, downwardly compressed and/or plowed.

Fig. 9 is an end elevation of a.v paddle of the .rotor shown in Fig. v8, and indicates material being gathered from screen 22, on which is formed or maintained the Credo filter bed, indicated by numeral 22L The paddlesof this rotormay likewise be'arranged .to plowgas well as cornpress or transfer, the material during rotation.

Fig. 10 illustrates a rotor equipped with paddles having curved ends, which can be rotated in either direction to retard or expedite movement of thematerial; V I

While. several applications, modifications. and

combinations have been .dealt with, to disclose I some of the actual uses for whichthe incident method and apparatus can beemployed, ,many other variations and combinations are available to expeditiously process a, wide range of materials. a

Having thus described my invention-,"I"claim:

'1. In an apparatus for straining and filtering liquid containing non-liquid material the combination of an angularly disposed planar screen and a plurality of angularly disposed paddles rotating in a plane spaced substantially parallel from and cooperating with said screen for manipulating said materiaL. 2; In an apparatus for straining and filtering 5 liquid containing noneliquid'materialthe combination of an angularly disposed planar screen and a plurality of perforated paddles rotating in a plane spaced substantially parallel from and cooperating Withsaid screen for manipulating said material.

3. Inan apparatus for straining and filtering liquid-containing non-liquid material the combination of an angularly disposed screen consisting of a perforated'plate having a substantially fiat face and a plurality of rotors equipped with perforated paddles rotating in a. plane substantially parallel to and cooperating with-said screen for handling said material. 1

4."A filtering'apparatus comprising an inclined screen over whichf'wet material moves gravitationally; means depositing wet material on said screen atan elevated point; "means' distributing the*deposited material over the surface of said screen to provide 'afthorough filtering iof liquid therefrom, said distributingmeansi comprising a succession of rotating vanes each having their axis of rotation substantially perpendicular to the surface of said inclined scre en'and having a path of travel overlapping thepath or travel of'an adjacent ,vane, to provide acontinuous. distribution of the said material in its gravitational move-.

mentdown the said inclined screen; and means 'collecting'the liquid filtered fromsaid material and passing through said screen. U

5. A filtering apparatus comprising an inclined screen overwhich wet material moves gravitationally;',means depositing wet material on said screen at an elevated point;- a plurality of shafts positioned above, andfsubstantially perpendicular to'the surface of said inclined screen; a sucj cession of substantially radial vanes each at tached to each shaft, the vanes of each shaft hav-- ing a path of travel overlapping the path of travel of the vanes of an adjacent shaft, to provide a continuous distribution ;of the said materialover the surface of the said screen in its gravitational movement down the saidinclined'screen; means rotating alternate shafts in one direction, an d the intermediate shafts ina'reverse direction, the vanes attached to each shaft pushingfthe deposited, mateIiaLin its gravitational movement 'dovvn the in clined screen, horizontally into .the

path of travel of the vanes of an adjacent shaft, to lengthen the, path of travel'of said material while moving over said screen; and means col- .lecting liquid filtered from said material and passing through said screen.

6. An apparatus for filtering wet material comprising an inclinedscreenfmeans depositing wet materialon said. screen at an elevated .point;

means. breaking up-the deposited material byv moving the upper portion of the deposited mate- 1 rial transversely of said screen inalternate directions to provide a thorough filtering 'of liquid therefrom through the portion, of thematerial remaining in. contact with the surface of said screen, the latter means comprising a plurality of megbersrotating in a plane substantially parall to the surface of said screen, thepath of :travel of each member overlappingthe path of travel of an adjacent member to provide a continuous breaking-up of the material as the said material moves down the said inclined screen; and means rotating the alternate members in one direction, and the intermediate members in a reverse direction, to provide the alternate movement of the upper portion of the material, as

recited.

7. An apparatus for filtering wet material comprising an inclined screen on which the material moves gravitationally; means depositing wet materlal on said screen atan elevated point; means moving the deposited material in a substantially sinusoidal path over the surface of said screen to lengthen the path of travel of the deposited material thereover, said moving means comprising a plurality of shafts positioned above, andclined screen, into the path of travel of thevanes of an adjacent shaft, to provide the sinusoidal movement of the deposited material, as recited.

8. An apparatus for filtering wet material including an inclined screen; means depositing wet material onpsaid screen at an elevated point; means continuously stirring a portion of the deposited material to provide a thorough filtering of liquid therefrom through a portion of said material remaining in contact with the surface of said screen, said stirring means comprising a succession of rotating elements, each having a path of travel extending into the path of the wet material, and overlapping the path of travel of an adjacent element.

9. An apparatus for filtering wet material including an inclined screen on which the material moves gravitationa1ly;' meansdepositing wet material on said screen at an elevated point; means "continuously stirring the deposited material to provide a thorough filtering of liquid therefrom through said screen, said stirring means comprising a succession of rotating elements, each continuously rotating in the said material, and

having a path of travel overlapping the path of travel of an adjacent element to provide the, continuous stirring of the wet material as recited. 25

ADOLPH w; rissauna. 

